Your talking about the system that uses nitrous to cool the intake charge right. IMO it's a waste of money. It does work but you won't see a big performance improvement from it. Use you money for like a 25 shot of nitrous, I think you will get more of a KICK out of that.
____________________ Honda's are like assholes, everyone has one.
There was a discussion about this on the old board, but I don't think it's up anymore. I did alot of research on this a while back and the jist of it was that it's nice to have for a FI car, but on a NA car it doesn't do much to justify the cost. While the cost of filling a bottle with CO2 is cheaper than with N2O, the system itself is just as costly.
IMO, spend the money on a good nitrous kit and be done with it.